Nevada Resource Estimate Tables
« Go back| Northumberland Project | Tons | Average Gold Grade (oz Au/ton) | Average Gold Grade (g Au/tonne) | Average Silver Grade (oz Ag/ton) | Average Silver Grade (g Ag/tonne) | Contained Gold (oz) | Contained Silver (oz) | Contained Gold Equivalent (oz Au-eq) |
| Measured gold | - | - | - | - | - | - | - | - |
| Indicated gold | 36,518,000 | 0.069 | 1.92 | - | - | 2,259,000 | - | 2,259,000 |
| Indicated silver | 36,518,000 | - | - | 0.23 | 7.72 | 9,062,000 | 181,000 | |
| Total Indicated Resources | 36,518,000 | 0.069 | 1.92 | 0.23 | 7.72 | 2,259,000 | 9,062,000 | 2,440,000 |
| Inferred Gold Resources | 6,926,000 | 0.10 | 3.49 | - | - | 776,300 | - | 776,300 |
| Inferred Silver Resources | 6,926,000 | - | - | 0.18 | 6.3 | - | 1,403,000 | 27,700 |
| Total Inferred Resources | 6,926,000 | 0.10 | 3.49 | 0.18 | 6.3 | 776,300 | 1,403,000 | 804,000 |
Northumberland Footnote
1: AuEq calculated at a Au:Ag ratio of 50:1 and assumes 100% recovery of both metals. Mineral resources are not mineral reserves and do not have demonstrated economic viability, and there is no guarantee that any resource will become a reserve. Christopher Lee, P. Geo, Chief Geoscientist for Fronteer Development Group., is the designated Qualified Person who has prepared the Northumberland resource estimate. Mineral resources have been estimated in accordance with the standards adopted by the Canadian Institute of Mining, Metallurgy and Petroleum ("CIM") Council in November 2003, as amended, and prescribed by the Canadian Securities Administrators' National Instrument 43-101 Standards of Disclosure for Mineral Projects. The mineral resource estimate is as of May 1, 2008 and was conducted using a combination of Ordinary Kriging (gold) and Inverse-Distance Weighting (silver) grade interpolations within an ‘unwrinkled' 3-D block model in Gemcom software. A total of 17,149 assays from 1,119 drill holes (core, RC and rotary drilling) were capped and composited to 10 ft lengths, then separated into high and low grade domains within three distinct mineralized horizons, constrained by hand-digitized, 3-D solids. Each horizon was ‘unwrinkled' into a separate flat horizon to facilitate continuous interpolation across variably dipping segments of the deposit, then back-transformed into real space. Densities were based on 295 s.g. measurements and assigned according to lithological proportions in different areas of the deposit and degree of oxidation. Three different resource types were defined in order to reflect the different anticipated costs of extraction for open pit versus underground mining, and heap leach versus sulfide processing. Cut-off grades for each resource type were estimated using cost ranges of existing operations for various parameters, such as mining and processing costs, metal recoveries, general and administrative, sales and refining costs, and an assumed gold price of $700 per ounce. The three different resource types are: open pit oxide and sulfide, based on gold cyanide extraction ratios (oxide resource = cyanide leach assay/fire assay greater than 0.5), and underground, based on depth below surface (2,286-metre elevation, constrained by preliminary internal Lerchs-Grossman pit optimizations). Mineral resources were classified according to: (i) geological confidence, (ii) number of drill holes, and (iii) average distances to samples used in each block estimate. Further details of the estimation procedure are available in the amended and restated NI 43-101 report, which is posted on SEDAR (http://www.sedar.com/).| Sandman Project | Tons | Average Gold Grade (oz Au/ton) | Average Gold Grade (g Au/tonne) | Average Silver Grade (oz Ag/ton) | Average Silver Grade (g Ag/tonne) | Contained Gold (oz) | Contained Silver (oz) | Contained Gold Equivalent (oz Au-eq) |
| Measured Resources | 1,710,000 | 0.048 | 1.65 | - | - | 82,100 | - | 82,100 |
| Indicated Resources | 6,323,000 | 0.030 | 1.03 | - | - | 189,800 | - | 189,800 |
| Total Measured and Indicated Resources | 8,033,000 | 0.034 | 1.17 | - | - | 271,900 | - | 271,900 |
| Inferred Resources | 1,418,000 | 0.027 | 0.93 | - | - | 38,000 | - | 38,000 |
Sandman Footnote
2: Resources reported at a different cut-off grade for material above (0.01 oz Au/ton, or 0.34 g Au/t) and below (0.02 oz Au/ton, or 0.69 g Au/t) a threshold elevation of 4,200 feet to account for different potential mining methods at different depths. The mineral resource expressed is based on the NI 43-101 Technical Report prepared by Mine Development Assoc as of Nov. 1, 2007. The cut-off grade (expressed in ounces of gold per ton) for Sandman Project measured, indicated and inferred resources is 0.01 oz Au/ton for all of the shallow deposits and 0.02 oz Au/ton for the deeper zones at the Southeast Pediment deposit. Michael Gustin, Ph.D., of Mine Development Associates ("MDA"), Reno, Nevada, is designated as a Qualified Person for the Sandman resource estimate, with the ability and authority to verify the authenticity of, and validity of, this data. Mineral resources have been estimated by MDA in accordance with the standards adopted by the Canadian Institute of Mining, Metallurgy and Petroleum ("CIM") Council in August 2000, as amended, and prescribed by the Canadian Securities Administrators' National Instrument 43-101 Standards of Disclosure for Mineral Projects. For further details on how these resources were calculated, please view the technical reports at http://www.sedar.com/.| Zaca Project | Tons | Average Gold Grade (oz Au/ton) | Average Gold Grade (g Au/tonne) | Average Silver Grade (oz Ag/ton) | Average Silver Grade (g Ag/tonne) | Contained Gold (oz) | Contained Silver (oz) | Contained Gold Equivalent (oz Au-eq) |
| Measured Resources | 8,097,000 | 0.019 | 0.65 | 0.704 | 24.1 | 151,000 | 5,700,000 | 236,000 |
| Indicated Resources | 18,730,000 | 0.014 | 0.48 | 0.707 | 24.2 | 266,000 | 13,242,000 | 464,000 |
| Total Measured and Indicated Resources | 26,827,000 | 0.016 | 0.55 | 0.706 | 24.2 | 417,000 | 18,942,000 | 700,000 |
| Inferred Resources | 329,000 | 0.018 | 0.62 | 1.033 | 35.4 | 6,000 | 340,000 | 11,000 |
Zaca Footnote
3: Resources are reported at a Au equivalent cut-off grade of 0.01 oz Au-eq/ton (0.34 g Au-eq/t) to fairly represent the in situ metal content from the two overlapping metal distributions. Au equivalent grades were calculated using a Au:Ag price ratio of 67:1. No metallurgical recoveries were used to modify the ratio. The resource estimate is from the 43-101 Compliant Report: Updated Technical Report of the Zaca Project Alpine County, California USA, by Mine Development Associates ("MDA"). The cut-off grade (expressed in ounces of gold per ton) for the Zaca Project measured, indicated and inferred resources is 0.01 ounces of gold equivalent per ton. Mineral resources are not mineral reserves and do not have demonstrated economic viability, and there is no guarantee that any resource will become a reserve. Steven Ristorcelli, P. Geo, of MDA, Reno, Nevada, is designated as a Qualified Person for the Zaca resource estimate, with the ability and authority to verify the authenticity of, and validity of, this data. Mineral resources have been estimated by MDA in accordance with the standards adopted by the Canadian Institute of Mining, Metallurgy and Petroleum ("CIM") Council in August 2000, as amended, and prescribed by the Canadian Securities Administrators' National Instrument 43-101 Standards of Disclosure for Mineral Projects. For further details on how these resources were calculated, please view the technical reports, at http://www.sedar.com/.
Long Canyon Resource Estimate
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Cut-off (g/t Au) | Tonnes | g/t Au | oz Au | Cut-off (g/t Au) | Tonnes | g/t Au | oz Au |
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0.30 | 4,808,000 | 2.35 | 363,000 | 0.30 | 8,780,000 | 1.63 | 459,000 |
0.50 | 3,691,000 | 2.94 | 349,000 | 0.50 | 6,236,000 | 2.13 | 428,000 |
1.00 | 2,496,000 | 4.01 | 322,000 | 1.00 | 3,634,000 | 3.16 | 369,000 |
1.50 | 1,975,000 | 4.75 | 302,000 | 1.50 | 2,700,000 | 3.83 | 332,000 |
3.00 | 1,272,000 | 6.19 | 253,000 | 3.00 | 1,312,000 | 5.56 | 234,000 |
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The Classified Mineral Resource estimate is quoted at a cut-off grade of 0.30 g/t gold. The block-diluted resources are shown at additional cut-offs in order to provide grade-distribution information. Long Canyon mineral resource estimation as of February 9, 2009. The Long Canyon mineral resource estimation was completed by Mine Development Associates ("MDA"). The resources were modelled and estimated by evaluating the drill data statistically and utilizing three-dimensional lithologic solids provided by Fronteer to interpret mineral domains on cross sections spaced at 50-metre intervals throughout the extent of the Long Canyon mineralization. The mineral domain interpretations were then rectified on cross sections spaced at 10-metre intervals. The modeled mineralization was analyzed statistically to establish estimation parameters, and gold grades were estimated by inverse-distance methods into a block model with 5 metre (width) x 10 metre (length) x 3 metre (height) blocks that were coded to the mineral domains by the 10-metre mineral domain polygons. All modelling of the diluted resources was performed using Gemcom Surpac® software. Quality-control data generated during the various drill programs conducted at Long Canyon were independently reviewed by MDA as part of the resource study. The person responsible for the resource estimate on behalf of MDA is Michael Gustin, Ph.D., P. Geo, a Qualified Person as defined by National Instrument 43-101. Further details of the estimation procedure is available in an updated NI 43-101 report, posted on SEDAR (http://www.sedar.com/), on April 27, 2009.